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/*****************************************************************************
* Johns Hopkins University
* Center For Astrophysical Sciences
* FUSE
*****************************************************************************
*
* Synopsis: cf_time_xy_distort(fitsfile *header, long nevents,
* float *xfarf, float *yfarf, unsigned char *locflags)
*
* Description: Corrects each photon event in the active area for long-term
* drifts in the X and Y coordinate scales.
*
* Arguments: fitsfile *header Pointer to FITS file containing the
* header of the intermediate data file
* long nevents The number of events
* float *xfarf An array of event X positions
* float *yfarf An array of event Y positions
* unsigned char *locflags Location flags for each event
*
* Calls:
*
* Return: 0 on success
*
* History: 11/01/06 1.1 wvd Based on cf_count_rate_y_distort.c
* 11/22/06 1.2 wvd Read BIN_FACT from file header.
* Make X correction a function of X.
* 01/19/07 1.3 wvd Clean up i/o.
* 04/07/07 1.4 wvd Clean up compiler warnings.
*
****************************************************************************/
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include "calfuse.h"
int
cf_time_xy_distort(fitsfile *header, long nevents,
float *xfarf, float *yfarf, unsigned char *locflags)
{
char CF_PRGM_ID[] = "cf_time_xy_distort";
char CF_VER_NUM[] = "1.4";
char tmxyfile[FLEN_VALUE];
int errflg=0, hdutype, status=0, anynull=0;
int binfact, i, ii, i_max, tndx, xndx, yndx;
long j, xlen, ylen;
double expstart;
float *xstretch2d, *ystretch2d, xstretch1d[NXMAX], ystretch1d[NYMAX];
fitsfile *tmxyfits;
cf_error_init(CF_PRGM_ID, CF_VER_NUM, stderr);
cf_timestamp(CF_PRGM_ID, CF_VER_NUM, "Begin Processing");
if ((errflg = cf_proc_check(header, CF_PRGM_ID))) return errflg;
/*
* Read MJD of exposure start.
*/
FITS_read_key(header, TDOUBLE, "EXPSTART", &expstart, NULL, &status);
/*
* Read the X correction array.
* Note: the first column of the calibration array contains MJD.
*/
FITS_read_key(header, TSTRING, "TMXY_CAL", tmxyfile, NULL, &status);
cf_verbose(3, "Reading TMXY_CAL file %s", tmxyfile);
FITS_open_file(&tmxyfits, cf_cal_file(tmxyfile), READONLY, &status);
FITS_movabs_hdu(tmxyfits, 2, &hdutype, &status);
FITS_read_key(tmxyfits, TLONG, "NAXIS1", &xlen, NULL, &status);
FITS_read_key(tmxyfits, TLONG, "NAXIS2", &ylen, NULL, &status);
FITS_read_key(tmxyfits, TINT, "BIN_FACT", &binfact, NULL, &status);
xstretch2d = (float *) cf_malloc(sizeof(float)*xlen*ylen);
FITS_read_img(tmxyfits, TFLOAT, 1L, xlen*ylen, NULL, xstretch2d,
&anynull, &status);
/*
* Find the row in the calibration array that corresponds to the
* exposure start time.
*/
i = 0;
while (expstart > *(xstretch2d+i*xlen) && i < ylen) i++;
tndx = i-1;
if (tndx < 0) tndx = 0;
cf_verbose(2,"EXPSTART = %g.", expstart);
cf_verbose(2,"Using X corrections for MJD >= %g", *(xstretch2d+tndx*xlen));
if (tndx < ylen-1)
cf_verbose(2," and MJD < %g",
*(xstretch2d+(tndx+1)*xlen));
/*
* Now compute a 1-D array containing corrections to X
* coordinate as a function of X position on the detector.
* Shift information binned by BIN_FACT pixels.
* We interpolate to the nearest X pixel. Otherwise,
* counts pile up at the boundaries.
*/
i_max = (xlen-2) * binfact;
for (i = 0; i < i_max; i++) {
ii = (i/binfact) * binfact;
xstretch1d[i] = ((ii+binfact-i) * (xstretch2d+tndx*xlen)[1+i/binfact] +
(i-ii) * (xstretch2d+tndx*xlen)[2+i/binfact]) / binfact;
}
for ( ; i < NXMAX; i++)
xstretch1d[i] = (xstretch2d+tndx*xlen)[xlen-1];
/*
* Read the Y correction array.
*/
FITS_movabs_hdu(tmxyfits, 3, &hdutype, &status);
FITS_read_key(tmxyfits, TLONG, "NAXIS1", &xlen, NULL, &status);
FITS_read_key(tmxyfits, TLONG, "NAXIS2", &ylen, NULL, &status);
FITS_read_key(tmxyfits, TINT, "BIN_FACT", &binfact, NULL, &status);
ystretch2d = (float *) cf_malloc(sizeof(float)*xlen*ylen);
FITS_read_img(tmxyfits, TFLOAT, 1L, xlen*ylen, NULL, ystretch2d,
&anynull, &status);
FITS_close_file(tmxyfits, &status);
/*
* Find the row in the calibration array that corresponds to the
* exposure start time.
*/
i = 0;
while (expstart > *(ystretch2d+i*xlen) && i < ylen) i++;
tndx = i-1;
if (tndx < 0) tndx = 0;
cf_verbose(3,"Using Y corrections for MJD >= %g", *(ystretch2d+tndx*xlen));
if (tndx < ylen-1)
cf_verbose(3," and MJD < %g",
*(ystretch2d+(tndx+1)*xlen));
/*
* Now compute a 1-D array containing corrections to Y
* coordinate as a function of Y position on the detector.
*/
i_max = (xlen-2) * binfact;
for (i = 0; i < i_max; i++) {
ii = (i/binfact) * binfact;
ystretch1d[i] = ((ii+binfact-i) * (ystretch2d+tndx*xlen)[1+i/binfact] +
(i-ii) * (ystretch2d+tndx*xlen)[2+i/binfact]) / binfact;
}
for ( ; i < NYMAX; i++)
ystretch1d[i] = (ystretch2d+tndx*xlen)[xlen-1];
cf_verbose(3, "For y = 430, ystretch = %f\n", ystretch1d[430]);
cf_verbose(3, "For y = 810, ystretch = %f\n", ystretch1d[810]);
/*
* Loop through all events. Move only events in active region.
*/
for (j = 0; j < nevents; j++) {
if (!(locflags[j] & LOCATION_SHLD)) {
xndx = (int) xfarf[j];
if (xndx < 0) xndx = 0;
else if (xndx >= NXMAX) xndx = NXMAX-1;
yndx = (int) yfarf[j];
if (yndx < 0) yndx = 0;
else if (yndx >= NYMAX) yndx = NYMAX-1;
xfarf[j] += xstretch1d[xndx];
yfarf[j] += ystretch1d[yndx];
}
}
free(xstretch2d);
free(ystretch2d);
cf_proc_update(header, CF_PRGM_ID, "COMPLETE");
cf_timestamp(CF_PRGM_ID, CF_VER_NUM, "Done processing");
return 0;
}
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